Cofunction Identities

Front

What is the cofunction identity for sine?

Back

sin(θ) = cos(90° - θ)

Front

What is the cofunction identity for cosine?

Back

cos(θ) = sin(90° - θ)

Front

What is the cofunction identity for tangent?

Back

tan(θ) = cot(90° - θ)

Front

What is the cofunction identity for cotangent?

Back

cot(θ) = tan(90° - θ)

Front

What is the cofunction identity for secant?

Back

sec(θ) = csc(90° - θ)

Front

What is the cofunction identity for cosecant?

Back

csc(θ) = sec(90° - θ)

Front

If sin(60°) = cos(θ), what is θ?

Back

θ = 30°

Front

If sin(x) = cos(x), what is the value of x?

Back

x = 45°

Front

If sin(θ) = cos(40°), what is θ?

Back

θ = 50°

Front

If sin(x) = cos(y), what must be true about x and y?

Back

x + y = 90°